I was on youtube listening to this girl play one of my favorite songs acoustically and she said her guitar was tuned to "C standard". I learned how to play part of the song, but the fact that my guitar isn't tuned the way hers is makes it sound slightly different. Her guitar has a "heavier" sound with that tuning which I really like. I'm still quite a novice at the guitar, so can someone as clearly as possible explain how I can tune my guitar that way? Are there any apps that can further help me get the right sound? I already use PitchLab to tune my guitar the usual way.